Shear resistance of concrete contribution in RC beams under flexure and shear
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ORIGINAL PAPER
Shear resistance of concrete contribution in RC beams under flexure and shear Mohammad Farzana1 · T. Anjani Prasad1 · G. Papa Rao1 Received: 12 September 2019 / Accepted: 20 July 2020 © Springer Nature Switzerland AG 2020
Abstract A Reinforced Concrete (RC) beam subject to flexure and shear is designed to resist both the forces, flexure and shear. Bending resistance is developed under the action of concrete and flexural reinforcement. Shear resistance of the beam originates from two sources, concrete and shear reinforcement. All the national codes developed tables showing the shear resistance contributed by concrete for the grade of concrete and percentage of flexural reinforcement contained by the RC beam. Of the total shear on the beam, while part of it borne by concrete and the balance is taken care of by shear reinforcement; this is the shear design principle of RC beams. It has been noted for several years that the shear design procedure suffers from the inaccurate computation of shear resistance of concrete in RC beams; what is taken in design is lower than the actual shear resistance of concrete in a beam. ACI 318: 2014 brought the shear contribution of concrete closer to the test results. Such correction has to be made in IS 456: 2000. The six RC beams tests reported, contributed test results in this direction. Keywords Shear resistance · Bending resistance · Flexural reinforcement · Shear contribution
Literature review Shear resistance of concrete Generally, shear resistance of an RC beam is estimated to comprise partly from concrete and the balance from shear reinforcement. Based on tests, it is formulated that the shear strength of concrete increases as the grade of concrete increases and also as the percentage of flexural reinforcement increases. IS 456:2000 in its Table 19, the shear strength increase is shown from the grade of concrete M15 to M40. Similarly, the shear strength increase is shown from flexural reinforcement percentage 0.15–3.0. IS 456: 2000 needs revision in the shear strength increase due to concrete for different grades of concrete and percentages of flexural reinforcement. In the previous research activities performed on the shear contribution of concrete, Yu-Fei Wu et al. (2017) conducted tests on 7 different beams and measured strains of the shear reinforcement by connecting strain gauges to them without * G. Papa Rao [email protected] 1
Department of Civil Engineering, Gayatri Vidya Parishad College of Engineering(A), Visakhapatnam 530048, India
disturbing the bond between concrete and steel. In the work they concluded two things, the critical diagonal crack cannot be distinguished from other cracks before final failure occurs and secondly, they concluded that the shear resistance of concrete (Vc) increases with increase in the size of aggregate and also increases the shear strength of the beam. Moayyad M. Al-Nasra, Naiem M Asha (2013) in their study focused on different types of shear reinforcement in concrete beams. In their work new types of shear rei
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